In the position below, how many moves does White need to perform the fastest possible checkmate?
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It is possible to checkmate Black in one move: move Pawn to g7 to g8 (move one step forward) and promote it to a Knight.
With White Queen attacking Black king, the Black king is unable to move. No Black units can dodge/block White queen's attack, and Black king can't move from this position h7.
Black King can't take White Knight on g8 because the White Rook is guarding the g-file.
And lastly, Black King can't move to h6 because the promoted white knight attacks that square. Its a checkmate.
Rookie mistake : Most often users will promote the Pawns to a Queen because it is the strongest and most valuable unit in the game (other than the King, of course), but this is not always the case, as illustrated in the explanation above.